#include <iostream>

using namespace std;


int calculate(int m)
{
	int count = 0;
	if(m < 0)
		return -1;
	for(int index = 0; index <= m; ++index)
		count += m;
	return m;

}

int main()
{
	//LIshieng147

	system("pause");
	return 0;
}